Add Flux from() and filter() methods

Signed-off-by: davidarendsen <davidarendsen@hey.com>

src/Expression/Base.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Expression;
+
+abstract class Base {
+
+	/**
+	 * @throws ExpressionNotImplementedException
+	 */
+	public function __toString()
+    {
+		throw new ExpressionNotImplementedException('__toString', get_class($this));
+	}
+
+}

src/Expression/ExpressionNotImplementedException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Expression;
+
+use Exception;
+
+class ExpressionNotImplementedException extends Exception {}

src/Expression/Filter/AndExpression.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Expression\Filter;
+
+use Arendsen\FluxQueryBuilder\Expression\Base;
+
+class AndExpression extends Base {
+
+    /**
+     * @var string $key
+     */
+    private $key;
+
+    /**
+     * @var string $value
+     */
+    private $value;
+
+    public function __construct(string $key, string $value)
+    {
+        $this->key = $key;
+        $this->value = $value;
+    }
+
+    public function __toString()
+    {
+        return 'and r.' . $this->key . ' == "' . $this->value . '"';
+    }
+
+}

src/Expression/Filter/Measurement.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Expression\Filter;
+
+use Arendsen\FluxQueryBuilder\Expression\Base;
+
+class Measurement extends Base {
+
+    /**
+     * @var array $measurement
+     */
+    private $measurement;
+
+    public function __construct(string $measurement)
+    {
+        $this->measurement = $measurement;
+    }
+
+    public function __toString()
+    {
+        return 'r._measurement == "' . $this->measurement . '"';
+    }
+
+}

src/Expression/Filter/OrExpression.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Expression\Filter;
+
+use Arendsen\FluxQueryBuilder\Expression\Base;
+
+class OrExpression extends Base {
+
+    /**
+     * @var string $key
+     */
+    private $key;
+
+    /**
+     * @var string $value
+     */
+    private $value;
+
+    public function __construct(string $key, string $value)
+    {
+        $this->key = $key;
+        $this->value = $value;
+    }
+
+    public function __toString()
+    {
+        return 'or r.' . $this->key . ' == "' . $this->value . '"';
+    }
+
+}

src/Function/Base.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Function;
+
+abstract class Base {
+
+	/**
+	 * @throws FunctionNotImplementedException
+	 */
+	public function __toString()
+    {
+		throw new FunctionNotImplementedException('__toString', get_class($this));
+	}
+
+}

src/Function/Filter.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Function;
+
+class Filter extends Base {
+
+    /**
+     * @var array $settings
+     */
+    private $settings;
+
+    public function __construct(array $settings)
+    {
+        $this->settings = $settings;
+    }
+
+    public function __toString()
+    {
+        return '|> filter(fn: (r) => ' . implode(' ', $this->settings) . ') ';
+    }
+
+}

src/Function/From.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Function;
+
+class From extends Base {
+
+    /**
+     * @var array $settings
+     */
+    private $settings;
+
+    public function __construct(array $settings)
+    {
+        $this->settings = $settings;
+    }
+
+    public function __toString()
+    {
+        return 'from(' . implode(', ', $this->format($this->settings)) . ') ';
+    }
+
+    protected function format(array $settings)
+    {
+        array_walk($settings, function(&$value, $key) {
+			$value = $key . ': ' . (is_string($value) ? '"' . $value . '"' : $value);
+		});
+
+        return $settings;
+    }
+
+}

src/Function/FunctionNotImplementedException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Function;
+
+use Exception;
+
+class FunctionNotImplementedException extends Exception {}

src/QueryBuilder.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder;
+
+class QueryBuilder {
+
+    /**
+     * @var array $from
+     */
+    private $from;
+
+    /**
+     * @var string $measurement
+     */
+    private $measurement;
+
+    /**
+     * @var array $range
+     */
+    private $range;
+    
+    public function from(array $from): QueryBuilder
+    {
+        $this->from = $from;
+        return $this;
+    }
+
+    public function fromBucket(string $bucket): QueryBuilder {
+        $this->from = ['bucket' => $bucket];
+        return $this;
+    }
+
+    public function fromMeasurement(string $measurement): QueryBuilder
+    {
+        $this->measurement = $measurement;
+        return $this;
+    }
+
+    public function addRange(array $range): QueryBuilder
+    {
+        $this->range = $range;
+        return $this;
+    }
+
+    public function addRangeStart(string $rangeStart): QueryBuilder
+    {
+        $this->range = ['start' => $rangeStart];
+        return $this;
+    }
+
+    public function build(): string
+    {
+        //TODO: build the query dynamically here
+        return 'from(bucket: "test_bucket", host: "host", org: "example-org", token: "token") |> ';
+    }
+
+}